ReactBootstrap popover dismiss on click outside

For React Bootstrap 4.4 it's necessary to add a onHide function alongside rootClose, also these properties are for Overlay Component (not OverlayTrigger).

Here is an example:

function Example() {
  const [show, setShow] = useState(false);
  const target = useRef(null);

  const handleClick = (event) => {
    setShow(!show);
  };

  return (
    <div ref={ref}>
      <Button onClick={handleClick} ref={target}>Holy guacamole!</Button>

      <Overlay
        show={show}
        target={target.current}
        placement="bottom"
        rootClose
        onHide={() => setShow(false)}
      >
        <Popover id="popover-contained">
          <Popover.Title as="h3">Popover bottom</Popover.Title>
          <Popover.Content>
            <strong>Holy guacamole!</strong> Check this info.
          </Popover.Content>
        </Popover>
      </Overlay>
    </div>
  );
}

render(<Example />);

No you don't need any custom code. Just include rootClose prop and this will do for you. Its in the react bootstrap official documentation https://react-bootstrap.netlify.com/components/overlays/#overlays-api

<OverlayTrigger trigger='click' rootClose>
  ....
</OverlayTrigger>

I think this should work for you:

const Hello = () => (
  <ReactBootstrap.OverlayTrigger 
    trigger="focus" 
    placement="bottom" 
    overlay={
      <ReactBootstrap.Popover title="Popover bottom">
        <strong>Holy guacamole!</strong> Check this info.   
      </ReactBootstrap.Popover>
    }
  >
    <ReactBootstrap.Button bsStyle="default">Holy guacamole!</ReactBootstrap.Button>
  </ReactBootstrap.OverlayTrigger>
);

ReactDOM.render(<Hello />, document.getElementById('app'));

Here is jsfiddle